See other engines in this family
Mitsubishi 6G72 SOHC specs: 3.0L (181 ci) 6-cylinder, 91.1 x 76 mm (3.5866 x 2.9921 in) bore and stroke, 8.9:1 compression. Rated 161 hp, 1997–1999.
The Mitsubishi 6G72 SOHC is oversquare — the 3.5866" bore exceeds the 2.9921" stroke by 19.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.9921" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.2 ci (494 cc).
8.9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 9 engines in the Cyclone family, the smallest at 181 ci. 3 factory variants share these dimensions, rated at 161 hp across 1997–1999.
| Displacement | 181 ci / 3 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 2.9921" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 8.9:1 * |
| Bore/stroke ratio | 1.199 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Firing order | 1-2-3-4-5-6 |
| Advertised HP | 161 hp |
| Years | 1997–1999 |
| Bore/stroke character | 1.199 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.2 ci |
| Static compression | 8.9:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1997 | 161 hp | 6G72 SOHC |
| 1998 | 161 hp | 6G72 SOHC |
| 1999 | 161 hp | 6G72 SOHC |
2 factory vehicles, 1994–1999. Each year opens that model's engine table.